As has been stated here before, the background art from LILO AND STITCH is among some of Disney's finest. Compasrison's even to SNOW WHITE are fair... just look at these digitally re-created background paintings.
Look at the woodgrain texture, even wear marks on these stairs, as well as the perspective and use of shadow and light.
Love the tropical flowers and leaves on the left:
Such an interesting design, so real and cartooney at the same time:
This composition of the kitchen and stovetop is incredibly rich in detail. Smoke effects and simmering pot are "digital cel" overlays.
Note the subltlety of the landscape views in the "background within a background."